nginx.example

server {
    listen 80;
    listen [::]:80;
    server_name abermush.your-domain-name;
    root /var/www/abermush.your-domain-name/htdocs;
    access_log /dev/null;
    error_log /dev/null;
        client_max_body_size 20m;
        client_body_buffer_size 128k;

        limit_conn conn_limit_per_ip 10;
        limit_req zone=req_limit_per_ip burst=10 nodelay;

    rewrite ^ https://$server_name$request_uri? permanent;
}

server {
    listen 6221;
    #listen [::]:6221;
    root /var/www/abermush.your-domain-name/htdocs;

    location / {
        proxy_pass         http://localhost:6221;
        proxy_http_version 1.1;
        proxy_set_header   Upgrade "websocket";
        proxy_set_header   Connection "upgrade";
        proxy_set_header   Host $host;
    }
}

server {
    listen 443 ssl;
    #listen [::]:443 ssl;
    root /var/www/abermush.your-domain-name/htdocs;
    server_name abermush.your-domain-name;
    access_log /dev/null;
    error_log /dev/null;
    index index.html;
    charset utf-8;
    proxy_read_timeout 86400s;
    ssl_stapling off;
    ssl_stapling_verify off;
    ssl on;
    ssl_certificate /etc/letsencrypt/live/abermush.your-domain-name/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/abermush.your-domain-name/privkey.pem;
    ssl_dhparam /etc/ssl/certs/abermush.your-domain-name.dhparam;

    ssl_session_cache  builtin:1000  shared:SSL:10m;
    ssl_session_timeout 60m;
    ssl_prefer_server_ciphers on;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';
    add_header Content-Security-Policy "default-src 'self'; script-src https: 'unsafe-inline'; style-src https: 'unsafe-inline'";
    add_header X-Frame-Options DENY;
    add_header X-Content-Type-Options nosniff;
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Download-Options noopen;
    add_header X-Permitted-Cross-Domain-Policies none;

    add_header X-Robots-Tag "noindex, nofollow, nosnippet, noarchive";
    add_header Strict-Transport-Security "max-age=15768000; includeSubDomains" always;

    location /websocket {
        proxy_pass         http://localhost:6221;
        proxy_http_version 1.1;
        proxy_set_header   Upgrade "websocket";
        proxy_set_header   Connection "upgrade";
        proxy_set_header   Host $host;
    }

    location / {
        try_files $uri $uri/ =404;
    }
}